Detective Inspector Danny Doherty, the Liverpool crime manager, said the officers have joined the force with the major advantage of having served as transit officers prior to making the transition to state police.

"The probationary officers have a sound understanding of transit offences and are equipped with the knowledge of how to deal with confrontation," he said.

"This is particularly valuable in our line of work.

"They will make a good addition to the station, as they are coming in with some field experience."

Menai MP Melanie Gibbons welcomed the new officers. She said it was important the police continued to receive the resources and manpower needed to continue to keep the community safe.

"I know that the Liverpool local area command were in need of three more officers and I am pleased to see that their request has been met," she said.

"I look forward to personally meeting these new officers and welcoming them to the community.

"The NSW government continues to deliver on its election commitment to increase police numbers.

"Our commitment to increase police numbers, get more officers back to work and reduce the number of police officers leaving the force is now in action.